Nibco Stainless Steel Ball Valves

stainless steel
A form of steel containing chromium, resistant to tarnishing and rust
In metallurgy stainless steel, also known as inox steel or inox from French "inoxydable", is defined as a steel alloy with a minimum of 10.5 or 11% chromium content by mass. Stainless steel does not stain, corrode, or rust as easily as ordinary steel, but it is not stain-proof.
(Stainless steels) Steels that are corrosion and heat resistant and contain a minimum of 10% to 12% chromium. Other alloying elements are often present.
steel containing chromium that makes it resistant to corrosion

ball valves
A one-way valve that is opened and closed by pressure on a ball that fits into a cup-shaped opening
(ball valve) any valve that checks flow by the seating of a ball
(Ball valve) A ball valve is a valve with a spherical disc, the part of the valve which controls the flow through it. The sphere has a hole, or port, through the middle so that when the port is in line with both ends of the valve, flow will occur.
(Ball Valve) A simple non-return valve consisting of a ball resting on a cylindrical seat within a liquid passageway.